Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 32: Enabling Technologies: Sources of Quantum States of Light II
FM 32.6: Talk
Tuesday, September 24, 2019, 15:30–15:45, 1010
Efficient fiber-coupling of spectrally filtered and unfiltered photon pairs — •Tobias B. Gäbler1,2, Marta G. Basset1,2, Markus Gräfe1, Juan P. Torres3,4, and Fabian Steinlechner1,5 — 1Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Albert-Einstein-Straße 7, 07745 Jena, Germany — 2Friedrich-Schiller-Universität Jena, Institute of Applied Physics, Max-Wien-Platz 1, 07743 Jena, Germany — 3ICFO-Institut de Ciencies Fotoniques, 08860 Castelldefels, Spain — 4Universitat Politecnica de Catalunya, Jordi Girona 1-3, 08034 Barcelona, Spain — 5Friedrich Schiller University Jena, Abbe Center of Photonics, Albert-Einstein-Str. 6, 07745 Jena, Germany
Efficient coupling of photon pairs, generated by SPDC, into single spatial modes is of great relevance to studies of quantum physics and technologies. While several studies have addressed the issue of Gaussian mode coupling in SPDC, these often involved different approximations and experimental configurations, thus arriving at different conclusions.
We analyze the spatial properties of SPDC emission from periodically poled nonlinear crystals in the framework of transverse momentum. We study the impact of Gaussian beam parameters on fiber-coupling efficiency and present the results of a comprehensive series of experiments. We elaborate on trade-offs between heralding and pair-collection efficiency, in different spectral case and the dependency of pair emission rates on crystal length. These results will serve as a design guideline for ultra-efficient sources as required for quantum technologies.